Furnace foe the manufacture of gas



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J. G.'DODS. I FURNACE FOR THE MANUFACTURE OF GAs. No. 501,457. Patented July 11, 1893.

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J.0.DODS. v FURNACE FOR THE MANUFACTURE 01 GAS. No. 501,457; Patented July 11, 1893.

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(No Model.) 5 Sheets-Sheet 3.

J. U. DODS. FURNAGE FOR THE MANUFACTURE OF GAS.

No. 501,457. Patented July'll, 1893.

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7 J- O" DODS' v 5 Sl 1eet's-Sheet4.- FURNACE FOR THE MANUFACTURE OF GAS. No 501,457. I Patented July 11, 1898.

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J. 0.11.0.1) FURNAGE FOR THE ANU-F RE 0F GAS. N0. 501,457. 1 1 Patented July 11, 1893.

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JOHN c. DODS, or sT. LOUIS, MISSOURI, AssIe' oR To'JAMEs GREEN, OF SAME PLACE.

FURNACE FOR THE MANL JFACTURE OF GAS.

SPECIFICATION forming part Of Letters Patent NO. 501,457, dated July 11, 1893.

Application filed February 20, 1893. Serial No. 463,052. (No model.) I

To all whom it may concern.-

. Be it known that I, JOHN G. DODS, of the city of St. Louis, in the State of Missouri, have invented a certain new andv useful Improvement in Furnaces for the Manufacture of Gas, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to certain improvements in furnaces for the manufacture of gas, and my invention consists in novel features of construction hereinafter fully described and pointed out in the claims.

Figure I is a front elevation of my improved furnace. Fig. II is a vertical section, taken on line IIII, Fig. I. Fig. III is a vertical section, taken on the irregular line IIIIII, Fig. 1V. Fig. IV is a vertical, transverse section, taken on line IVIV, Fig. II. Fig. V is a horizontal section, the portion from A to B being taken on lineA-B, Fig. III; the portion from B to C being taken on line B-O, Fig. III; the portion from O to D being taken on line 0-D, Fig. IV; and/the portion from D to E being taken on line D-E, Fig. IV.

Referring to the drawings, 1 represents the front of the furnace.

2 are the side walls, 3 the rear wall, 4 the chimneys or up-takes, 5 the fire-box, and 6 the retorts. These parts may be of any desired form or construction.

I have shown a double furnace, or two furnaces side by side, but a single furnace or more than two furnaces may be used, and embody my invention.

The air to supply combustion, and form carbonic oxide, enters the lower, horizontal flues 7, passing to the rear of the furnace and returning to the front again .enters the fire-box, as indicated by the arrows in the lower part of Fig. V. These horizontal flues 7 are of approximately triangular shape in cross-section and have their widest portion at the bottom on one side of the down-flue and their narrowest portion at the top on the other side of the down-flue. The air which enters above the fire-box to complete combustion to form carbonic acid gas is admitted through the flues 8, see Fig. I, and passes to the rear of the furnace, and returns to the front of the furnace bustion.

again, where it escapes from the flue 8 into a like flue 8 above, through an opening 9, (see Fig. IV.) It passes back to the rear of the furnace through this second flue 8, and forwardl y again, when it escapes through an opening 10 into a third flue 8, and passes through a passage 11 into the chamber 12, over the firebox, where it unites with the products of com- The flues 8 are also of approximately triangular shape in cross-section having their widest portion at the bottom on one side of the down-fl no and their narrowest portion at the top on the otherside of the downflue, the narrowest portion of one flue meeting the narrowest portion of the flue above and the widest portion at the top meeting the widest portion of the flue above so that a vertical zigzag arrangement of spaces or chambers extends upward between each pair of fiues as shown in Fig. IV. The fines 8 as well as the fines 7, are preferably arranged on each side of the fire-box, and between these flues, on each side of the fire-box in the spaces or chambers is a series of flues 13 arranged in zigzag form vertically, while they extend horizontally the length of the furnace. The flames and products of combustion enter the top flue 13, through openings 14., communicating with the retort chamber, and pass from one flue 18 to the next flue beneath through openings 15, (see Fig. 1H,) and finally escape into a bottom flue 16 which conducts them to the chimney or uptake 4, as shown in Fig. III.

The down fines 13 are accessible through openings in the front wall of the furnace,

which are closed by plugs 17, and by removing these plugs, the flues can be readily cleaned out.

By arranging the tines 7 and Son each side of the lines 13, the air is highly heated before it is admitted to the furnace, and the efiicienoy of the furnace is thus greatly increased, while the arrangement of the flues 13 afford the best results in utilizing the escaping heat, and their arrangement is such that they can be readily cleaned out, by simply removing the plugs 17. v

The tiling is constructed throughout of unequal lengths for the purpose of forming broken joints longitudinally of the furnace.

By constructing the tiling of tri-angular shape in cross-section, I provide a very essential feature in a furnace of the class to which this invention relates, for the reason that by constructing the flues in this manner, there is obtained a great economy in space in the size of the furnace, and consequently in the condensed area in which the gas is manufactured and by the arrangement specified the passage of air is always from a larger portion of the flue into a larger portion of the adjoining flue so that the passage of air is as easy as it would be were the diameters of the flues of equal dimensions both above and below,

while at the same time the great saving in dimensions of the furnace and its consequent advantages are embodied 20 represents thedoor of the firebox.

21 is the door closing the opening through which the fuel is admitted, and which is preferably placed on or about thefioor'1ine'22'.

The upper 'flue 8 is'pr'eferably' provided with a register30, (see Figs. I and V,) which is" designed to be' used when the fire is first started, to admit additional oxygen directly over the fire-box.

I claim as my inventioni 1. A reoupe'rative furnace'fo'r the manufacttire of gas comprising the tiling in the tiall'y as described.

fiues 7, 8, of approximately triangular shape in cross-section; said tiling being alternately inverted so that the larger base of one flue 8 communicates to the larger top of the adjoinsection,vp'a's'si ng to the rear of the furnace and returning. to the frontagain, connected with each other-land with thexc'oinbustion chamber, and the. vertical zigzag down-fines 13 located between the horizontal fines and extending the lengthof the furnace; substan' JOHN C. Do'Ds.

= In presence of-'- ALBERT M. EBERSOLE, E. S. KNIGHT. 

